Loading...
1/*
2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
3 *
4 * Copyright (C) 2008, 2010 Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO: SPI, use power-down mode for suspend?, interrupt handling?
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/jiffies.h>
19#include <linux/i2c.h>
20#include <linux/hwmon.h>
21#include <linux/hwmon-sysfs.h>
22#include <linux/slab.h>
23
24#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
25#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
26#define ADT7411_REG_VDD_MSB 0x06
27#define ADT7411_REG_INT_TEMP_MSB 0x07
28#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
29
30#define ADT7411_REG_CFG1 0x18
31#define ADT7411_CFG1_START_MONITOR (1 << 0)
32#define ADT7411_CFG1_RESERVED_BIT1 (1 << 1)
33#define ADT7411_CFG1_EXT_TDM (1 << 2)
34#define ADT7411_CFG1_RESERVED_BIT3 (1 << 3)
35
36#define ADT7411_REG_CFG2 0x19
37#define ADT7411_CFG2_DISABLE_AVG (1 << 5)
38
39#define ADT7411_REG_CFG3 0x1a
40#define ADT7411_CFG3_ADC_CLK_225 (1 << 0)
41#define ADT7411_CFG3_RESERVED_BIT1 (1 << 1)
42#define ADT7411_CFG3_RESERVED_BIT2 (1 << 2)
43#define ADT7411_CFG3_RESERVED_BIT3 (1 << 3)
44#define ADT7411_CFG3_REF_VDD (1 << 4)
45
46#define ADT7411_REG_DEVICE_ID 0x4d
47#define ADT7411_REG_MANUFACTURER_ID 0x4e
48
49#define ADT7411_DEVICE_ID 0x2
50#define ADT7411_MANUFACTURER_ID 0x41
51
52static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
53
54struct adt7411_data {
55 struct mutex device_lock; /* for "atomic" device accesses */
56 struct mutex update_lock;
57 unsigned long next_update;
58 long vref_cached;
59 struct i2c_client *client;
60 bool use_ext_temp;
61};
62
63/*
64 * When reading a register containing (up to 4) lsb, all associated
65 * msb-registers get locked by the hardware. After _one_ of those msb is read,
66 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
67 * is protected here with a mutex, too.
68 */
69static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
70 u8 msb_reg, u8 lsb_shift)
71{
72 struct adt7411_data *data = i2c_get_clientdata(client);
73 int val, tmp;
74
75 mutex_lock(&data->device_lock);
76
77 val = i2c_smbus_read_byte_data(client, lsb_reg);
78 if (val < 0)
79 goto exit_unlock;
80
81 tmp = (val >> lsb_shift) & 3;
82 val = i2c_smbus_read_byte_data(client, msb_reg);
83
84 if (val >= 0)
85 val = (val << 2) | tmp;
86
87 exit_unlock:
88 mutex_unlock(&data->device_lock);
89
90 return val;
91}
92
93static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
94 bool flag)
95{
96 struct adt7411_data *data = i2c_get_clientdata(client);
97 int ret, val;
98
99 mutex_lock(&data->device_lock);
100
101 ret = i2c_smbus_read_byte_data(client, reg);
102 if (ret < 0)
103 goto exit_unlock;
104
105 if (flag)
106 val = ret | bit;
107 else
108 val = ret & ~bit;
109
110 ret = i2c_smbus_write_byte_data(client, reg, val);
111
112 exit_unlock:
113 mutex_unlock(&data->device_lock);
114 return ret;
115}
116
117static ssize_t adt7411_show_bit(struct device *dev,
118 struct device_attribute *attr, char *buf)
119{
120 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
121 struct adt7411_data *data = dev_get_drvdata(dev);
122 struct i2c_client *client = data->client;
123 int ret = i2c_smbus_read_byte_data(client, attr2->index);
124
125 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
126}
127
128static ssize_t adt7411_set_bit(struct device *dev,
129 struct device_attribute *attr, const char *buf,
130 size_t count)
131{
132 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
133 struct adt7411_data *data = dev_get_drvdata(dev);
134 struct i2c_client *client = data->client;
135 int ret;
136 unsigned long flag;
137
138 ret = kstrtoul(buf, 0, &flag);
139 if (ret || flag > 1)
140 return -EINVAL;
141
142 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
143
144 /* force update */
145 mutex_lock(&data->update_lock);
146 data->next_update = jiffies;
147 mutex_unlock(&data->update_lock);
148
149 return ret < 0 ? ret : count;
150}
151
152#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
153 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
154 adt7411_set_bit, __bit, __reg)
155
156static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
157static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
158static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
159
160static struct attribute *adt7411_attrs[] = {
161 &sensor_dev_attr_no_average.dev_attr.attr,
162 &sensor_dev_attr_fast_sampling.dev_attr.attr,
163 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
164 NULL
165};
166ATTRIBUTE_GROUPS(adt7411);
167
168static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)
169{
170 struct adt7411_data *data = dev_get_drvdata(dev);
171 struct i2c_client *client = data->client;
172 int ret;
173
174 switch (attr) {
175 case hwmon_in_input:
176 ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
177 ADT7411_REG_VDD_MSB, 2);
178 if (ret < 0)
179 return ret;
180 *val = ret * 7000 / 1024;
181 return 0;
182 default:
183 return -EOPNOTSUPP;
184 }
185}
186
187static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
188 long *val)
189{
190 struct adt7411_data *data = dev_get_drvdata(dev);
191 struct i2c_client *client = data->client;
192
193 int ret;
194 int lsb_reg, lsb_shift;
195 int nr = channel - 1;
196
197 mutex_lock(&data->update_lock);
198 if (time_after_eq(jiffies, data->next_update)) {
199 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
200 if (ret < 0)
201 goto exit_unlock;
202
203 if (ret & ADT7411_CFG3_REF_VDD) {
204 ret = adt7411_read_in_vdd(dev, hwmon_in_input,
205 &data->vref_cached);
206 if (ret < 0)
207 goto exit_unlock;
208 } else {
209 data->vref_cached = 2250;
210 }
211
212 data->next_update = jiffies + HZ;
213 }
214
215 switch (attr) {
216 case hwmon_in_input:
217 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
218 lsb_shift = 2 * (nr & 0x03);
219 ret = adt7411_read_10_bit(client, lsb_reg,
220 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
221 lsb_shift);
222 if (ret < 0)
223 goto exit_unlock;
224 *val = ret * data->vref_cached / 1024;
225 ret = 0;
226 break;
227 default:
228 ret = -EOPNOTSUPP;
229 break;
230 }
231 exit_unlock:
232 mutex_unlock(&data->update_lock);
233 return ret;
234}
235
236static int adt7411_read_in(struct device *dev, u32 attr, int channel,
237 long *val)
238{
239 if (channel == 0)
240 return adt7411_read_in_vdd(dev, attr, val);
241 else
242 return adt7411_read_in_chan(dev, attr, channel, val);
243}
244
245static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
246 long *val)
247{
248 struct adt7411_data *data = dev_get_drvdata(dev);
249 struct i2c_client *client = data->client;
250 int ret, regl, regh;
251
252 switch (attr) {
253 case hwmon_temp_input:
254 regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
255 ADT7411_REG_INT_TEMP_VDD_LSB;
256 regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
257 ADT7411_REG_INT_TEMP_MSB;
258 ret = adt7411_read_10_bit(client, regl, regh, 0);
259 if (ret < 0)
260 return ret;
261 ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
262 *val = ret * 250;
263 return 0;
264 default:
265 return -EOPNOTSUPP;
266 }
267}
268
269static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
270 u32 attr, int channel, long *val)
271{
272 switch (type) {
273 case hwmon_in:
274 return adt7411_read_in(dev, attr, channel, val);
275 case hwmon_temp:
276 return adt7411_read_temp(dev, attr, channel, val);
277 default:
278 return -EOPNOTSUPP;
279 }
280}
281
282static umode_t adt7411_is_visible(const void *_data,
283 enum hwmon_sensor_types type,
284 u32 attr, int channel)
285{
286 const struct adt7411_data *data = _data;
287
288 switch (type) {
289 case hwmon_in:
290 if (channel > 0 && channel < 3)
291 return data->use_ext_temp ? 0 : S_IRUGO;
292 else
293 return S_IRUGO;
294 case hwmon_temp:
295 if (channel == 1)
296 return data->use_ext_temp ? S_IRUGO : 0;
297 else
298 return S_IRUGO;
299 default:
300 return 0;
301 }
302}
303
304static int adt7411_detect(struct i2c_client *client,
305 struct i2c_board_info *info)
306{
307 int val;
308
309 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
310 return -ENODEV;
311
312 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
313 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
314 dev_dbg(&client->dev,
315 "Wrong manufacturer ID. Got %d, expected %d\n",
316 val, ADT7411_MANUFACTURER_ID);
317 return -ENODEV;
318 }
319
320 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
321 if (val < 0 || val != ADT7411_DEVICE_ID) {
322 dev_dbg(&client->dev,
323 "Wrong device ID. Got %d, expected %d\n",
324 val, ADT7411_DEVICE_ID);
325 return -ENODEV;
326 }
327
328 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
329
330 return 0;
331}
332
333static int adt7411_init_device(struct adt7411_data *data)
334{
335 int ret;
336 u8 val;
337
338 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
339 if (ret < 0)
340 return ret;
341
342 /*
343 * We must only write zero to bit 1 and bit 2 and only one to bit 3
344 * according to the datasheet.
345 */
346 val = ret;
347 val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
348 val |= ADT7411_CFG3_RESERVED_BIT3;
349
350 ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
351 if (ret < 0)
352 return ret;
353
354 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
355 if (ret < 0)
356 return ret;
357
358 data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
359
360 /*
361 * We must only write zero to bit 1 and only one to bit 3 according to
362 * the datasheet.
363 */
364 val = ret;
365 val &= ~ADT7411_CFG1_RESERVED_BIT1;
366 val |= ADT7411_CFG1_RESERVED_BIT3;
367
368 /* enable monitoring */
369 val |= ADT7411_CFG1_START_MONITOR;
370
371 return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
372}
373
374static const u32 adt7411_in_config[] = {
375 HWMON_I_INPUT,
376 HWMON_I_INPUT,
377 HWMON_I_INPUT,
378 HWMON_I_INPUT,
379 HWMON_I_INPUT,
380 HWMON_I_INPUT,
381 HWMON_I_INPUT,
382 HWMON_I_INPUT,
383 HWMON_I_INPUT,
384 0
385};
386
387static const struct hwmon_channel_info adt7411_in = {
388 .type = hwmon_in,
389 .config = adt7411_in_config,
390};
391
392static const u32 adt7411_temp_config[] = {
393 HWMON_T_INPUT,
394 HWMON_T_INPUT,
395 0
396};
397
398static const struct hwmon_channel_info adt7411_temp = {
399 .type = hwmon_temp,
400 .config = adt7411_temp_config,
401};
402
403static const struct hwmon_channel_info *adt7411_info[] = {
404 &adt7411_in,
405 &adt7411_temp,
406 NULL
407};
408
409static const struct hwmon_ops adt7411_hwmon_ops = {
410 .is_visible = adt7411_is_visible,
411 .read = adt7411_read,
412};
413
414static const struct hwmon_chip_info adt7411_chip_info = {
415 .ops = &adt7411_hwmon_ops,
416 .info = adt7411_info,
417};
418
419static int adt7411_probe(struct i2c_client *client,
420 const struct i2c_device_id *id)
421{
422 struct device *dev = &client->dev;
423 struct adt7411_data *data;
424 struct device *hwmon_dev;
425 int ret;
426
427 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
428 if (!data)
429 return -ENOMEM;
430
431 i2c_set_clientdata(client, data);
432 data->client = client;
433 mutex_init(&data->device_lock);
434 mutex_init(&data->update_lock);
435
436 ret = adt7411_init_device(data);
437 if (ret < 0)
438 return ret;
439
440 /* force update on first occasion */
441 data->next_update = jiffies;
442
443 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
444 data,
445 &adt7411_chip_info,
446 adt7411_groups);
447 return PTR_ERR_OR_ZERO(hwmon_dev);
448}
449
450static const struct i2c_device_id adt7411_id[] = {
451 { "adt7411", 0 },
452 { }
453};
454MODULE_DEVICE_TABLE(i2c, adt7411_id);
455
456static struct i2c_driver adt7411_driver = {
457 .driver = {
458 .name = "adt7411",
459 },
460 .probe = adt7411_probe,
461 .id_table = adt7411_id,
462 .detect = adt7411_detect,
463 .address_list = normal_i2c,
464 .class = I2C_CLASS_HWMON,
465};
466
467module_i2c_driver(adt7411_driver);
468
469MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
470 "Wolfram Sang <w.sang@pengutronix.de>");
471MODULE_DESCRIPTION("ADT7411 driver");
472MODULE_LICENSE("GPL v2");
1/*
2 * Driver for the ADT7411 (I2C/SPI 8 channel 10 bit ADC & temperature-sensor)
3 *
4 * Copyright (C) 2008, 2010 Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 *
10 * TODO: SPI, use power-down mode for suspend?, interrupt handling?
11 */
12
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/err.h>
17#include <linux/mutex.h>
18#include <linux/jiffies.h>
19#include <linux/i2c.h>
20#include <linux/hwmon.h>
21#include <linux/hwmon-sysfs.h>
22#include <linux/slab.h>
23
24#define ADT7411_REG_STAT_1 0x00
25#define ADT7411_STAT_1_INT_TEMP_HIGH BIT(0)
26#define ADT7411_STAT_1_INT_TEMP_LOW BIT(1)
27#define ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1 BIT(2)
28#define ADT7411_STAT_1_EXT_TEMP_LOW BIT(3)
29#define ADT7411_STAT_1_EXT_TEMP_FAULT BIT(4)
30#define ADT7411_STAT_1_AIN2 BIT(5)
31#define ADT7411_STAT_1_AIN3 BIT(6)
32#define ADT7411_STAT_1_AIN4 BIT(7)
33#define ADT7411_REG_STAT_2 0x01
34#define ADT7411_STAT_2_AIN5 BIT(0)
35#define ADT7411_STAT_2_AIN6 BIT(1)
36#define ADT7411_STAT_2_AIN7 BIT(2)
37#define ADT7411_STAT_2_AIN8 BIT(3)
38#define ADT7411_STAT_2_VDD BIT(4)
39#define ADT7411_REG_INT_TEMP_VDD_LSB 0x03
40#define ADT7411_REG_EXT_TEMP_AIN14_LSB 0x04
41#define ADT7411_REG_VDD_MSB 0x06
42#define ADT7411_REG_INT_TEMP_MSB 0x07
43#define ADT7411_REG_EXT_TEMP_AIN1_MSB 0x08
44
45#define ADT7411_REG_CFG1 0x18
46#define ADT7411_CFG1_START_MONITOR BIT(0)
47#define ADT7411_CFG1_RESERVED_BIT1 BIT(1)
48#define ADT7411_CFG1_EXT_TDM BIT(2)
49#define ADT7411_CFG1_RESERVED_BIT3 BIT(3)
50
51#define ADT7411_REG_CFG2 0x19
52#define ADT7411_CFG2_DISABLE_AVG BIT(5)
53
54#define ADT7411_REG_CFG3 0x1a
55#define ADT7411_CFG3_ADC_CLK_225 BIT(0)
56#define ADT7411_CFG3_RESERVED_BIT1 BIT(1)
57#define ADT7411_CFG3_RESERVED_BIT2 BIT(2)
58#define ADT7411_CFG3_RESERVED_BIT3 BIT(3)
59#define ADT7411_CFG3_REF_VDD BIT(4)
60
61#define ADT7411_REG_VDD_HIGH 0x23
62#define ADT7411_REG_VDD_LOW 0x24
63#define ADT7411_REG_TEMP_HIGH(nr) (0x25 + 2 * (nr))
64#define ADT7411_REG_TEMP_LOW(nr) (0x26 + 2 * (nr))
65#define ADT7411_REG_IN_HIGH(nr) ((nr) > 1 \
66 ? 0x2b + 2 * ((nr)-2) \
67 : 0x27)
68#define ADT7411_REG_IN_LOW(nr) ((nr) > 1 \
69 ? 0x2c + 2 * ((nr)-2) \
70 : 0x28)
71
72#define ADT7411_REG_DEVICE_ID 0x4d
73#define ADT7411_REG_MANUFACTURER_ID 0x4e
74
75#define ADT7411_DEVICE_ID 0x2
76#define ADT7411_MANUFACTURER_ID 0x41
77
78static const unsigned short normal_i2c[] = { 0x48, 0x4a, 0x4b, I2C_CLIENT_END };
79
80static const u8 adt7411_in_alarm_reg[] = {
81 ADT7411_REG_STAT_2,
82 ADT7411_REG_STAT_1,
83 ADT7411_REG_STAT_1,
84 ADT7411_REG_STAT_1,
85 ADT7411_REG_STAT_1,
86 ADT7411_REG_STAT_2,
87 ADT7411_REG_STAT_2,
88 ADT7411_REG_STAT_2,
89 ADT7411_REG_STAT_2,
90};
91
92static const u8 adt7411_in_alarm_bits[] = {
93 ADT7411_STAT_2_VDD,
94 ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1,
95 ADT7411_STAT_1_AIN2,
96 ADT7411_STAT_1_AIN3,
97 ADT7411_STAT_1_AIN4,
98 ADT7411_STAT_2_AIN5,
99 ADT7411_STAT_2_AIN6,
100 ADT7411_STAT_2_AIN7,
101 ADT7411_STAT_2_AIN8,
102};
103
104struct adt7411_data {
105 struct mutex device_lock; /* for "atomic" device accesses */
106 struct mutex update_lock;
107 unsigned long next_update;
108 long vref_cached;
109 struct i2c_client *client;
110 bool use_ext_temp;
111};
112
113/*
114 * When reading a register containing (up to 4) lsb, all associated
115 * msb-registers get locked by the hardware. After _one_ of those msb is read,
116 * _all_ are unlocked. In order to use this locking correctly, reading lsb/msb
117 * is protected here with a mutex, too.
118 */
119static int adt7411_read_10_bit(struct i2c_client *client, u8 lsb_reg,
120 u8 msb_reg, u8 lsb_shift)
121{
122 struct adt7411_data *data = i2c_get_clientdata(client);
123 int val, tmp;
124
125 mutex_lock(&data->device_lock);
126
127 val = i2c_smbus_read_byte_data(client, lsb_reg);
128 if (val < 0)
129 goto exit_unlock;
130
131 tmp = (val >> lsb_shift) & 3;
132 val = i2c_smbus_read_byte_data(client, msb_reg);
133
134 if (val >= 0)
135 val = (val << 2) | tmp;
136
137 exit_unlock:
138 mutex_unlock(&data->device_lock);
139
140 return val;
141}
142
143static int adt7411_modify_bit(struct i2c_client *client, u8 reg, u8 bit,
144 bool flag)
145{
146 struct adt7411_data *data = i2c_get_clientdata(client);
147 int ret, val;
148
149 mutex_lock(&data->device_lock);
150
151 ret = i2c_smbus_read_byte_data(client, reg);
152 if (ret < 0)
153 goto exit_unlock;
154
155 if (flag)
156 val = ret | bit;
157 else
158 val = ret & ~bit;
159
160 ret = i2c_smbus_write_byte_data(client, reg, val);
161
162 exit_unlock:
163 mutex_unlock(&data->device_lock);
164 return ret;
165}
166
167static ssize_t adt7411_show_bit(struct device *dev,
168 struct device_attribute *attr, char *buf)
169{
170 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(attr);
171 struct adt7411_data *data = dev_get_drvdata(dev);
172 struct i2c_client *client = data->client;
173 int ret = i2c_smbus_read_byte_data(client, attr2->index);
174
175 return ret < 0 ? ret : sprintf(buf, "%u\n", !!(ret & attr2->nr));
176}
177
178static ssize_t adt7411_set_bit(struct device *dev,
179 struct device_attribute *attr, const char *buf,
180 size_t count)
181{
182 struct sensor_device_attribute_2 *s_attr2 = to_sensor_dev_attr_2(attr);
183 struct adt7411_data *data = dev_get_drvdata(dev);
184 struct i2c_client *client = data->client;
185 int ret;
186 unsigned long flag;
187
188 ret = kstrtoul(buf, 0, &flag);
189 if (ret || flag > 1)
190 return -EINVAL;
191
192 ret = adt7411_modify_bit(client, s_attr2->index, s_attr2->nr, flag);
193
194 /* force update */
195 mutex_lock(&data->update_lock);
196 data->next_update = jiffies;
197 mutex_unlock(&data->update_lock);
198
199 return ret < 0 ? ret : count;
200}
201
202#define ADT7411_BIT_ATTR(__name, __reg, __bit) \
203 SENSOR_DEVICE_ATTR_2(__name, S_IRUGO | S_IWUSR, adt7411_show_bit, \
204 adt7411_set_bit, __bit, __reg)
205
206static ADT7411_BIT_ATTR(no_average, ADT7411_REG_CFG2, ADT7411_CFG2_DISABLE_AVG);
207static ADT7411_BIT_ATTR(fast_sampling, ADT7411_REG_CFG3, ADT7411_CFG3_ADC_CLK_225);
208static ADT7411_BIT_ATTR(adc_ref_vdd, ADT7411_REG_CFG3, ADT7411_CFG3_REF_VDD);
209
210static struct attribute *adt7411_attrs[] = {
211 &sensor_dev_attr_no_average.dev_attr.attr,
212 &sensor_dev_attr_fast_sampling.dev_attr.attr,
213 &sensor_dev_attr_adc_ref_vdd.dev_attr.attr,
214 NULL
215};
216ATTRIBUTE_GROUPS(adt7411);
217
218static int adt7411_read_in_alarm(struct device *dev, int channel, long *val)
219{
220 struct adt7411_data *data = dev_get_drvdata(dev);
221 struct i2c_client *client = data->client;
222 int ret;
223
224 ret = i2c_smbus_read_byte_data(client, adt7411_in_alarm_reg[channel]);
225 if (ret < 0)
226 return ret;
227 *val = !!(ret & adt7411_in_alarm_bits[channel]);
228 return 0;
229}
230
231static int adt7411_read_in_vdd(struct device *dev, u32 attr, long *val)
232{
233 struct adt7411_data *data = dev_get_drvdata(dev);
234 struct i2c_client *client = data->client;
235 int ret;
236
237 switch (attr) {
238 case hwmon_in_input:
239 ret = adt7411_read_10_bit(client, ADT7411_REG_INT_TEMP_VDD_LSB,
240 ADT7411_REG_VDD_MSB, 2);
241 if (ret < 0)
242 return ret;
243 *val = ret * 7000 / 1024;
244 return 0;
245 case hwmon_in_min:
246 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_LOW);
247 if (ret < 0)
248 return ret;
249 *val = ret * 7000 / 256;
250 return 0;
251 case hwmon_in_max:
252 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_VDD_HIGH);
253 if (ret < 0)
254 return ret;
255 *val = ret * 7000 / 256;
256 return 0;
257 case hwmon_in_alarm:
258 return adt7411_read_in_alarm(dev, 0, val);
259 default:
260 return -EOPNOTSUPP;
261 }
262}
263
264static int adt7411_update_vref(struct device *dev)
265{
266 struct adt7411_data *data = dev_get_drvdata(dev);
267 struct i2c_client *client = data->client;
268 int val;
269
270 if (time_after_eq(jiffies, data->next_update)) {
271 val = i2c_smbus_read_byte_data(client, ADT7411_REG_CFG3);
272 if (val < 0)
273 return val;
274
275 if (val & ADT7411_CFG3_REF_VDD) {
276 val = adt7411_read_in_vdd(dev, hwmon_in_input,
277 &data->vref_cached);
278 if (val < 0)
279 return val;
280 } else {
281 data->vref_cached = 2250;
282 }
283
284 data->next_update = jiffies + HZ;
285 }
286
287 return 0;
288}
289
290static int adt7411_read_in_chan(struct device *dev, u32 attr, int channel,
291 long *val)
292{
293 struct adt7411_data *data = dev_get_drvdata(dev);
294 struct i2c_client *client = data->client;
295
296 int ret;
297 int reg, lsb_reg, lsb_shift;
298 int nr = channel - 1;
299
300 mutex_lock(&data->update_lock);
301 ret = adt7411_update_vref(dev);
302 if (ret < 0)
303 goto exit_unlock;
304
305 switch (attr) {
306 case hwmon_in_input:
307 lsb_reg = ADT7411_REG_EXT_TEMP_AIN14_LSB + (nr >> 2);
308 lsb_shift = 2 * (nr & 0x03);
309 ret = adt7411_read_10_bit(client, lsb_reg,
310 ADT7411_REG_EXT_TEMP_AIN1_MSB + nr,
311 lsb_shift);
312 if (ret < 0)
313 goto exit_unlock;
314 *val = ret * data->vref_cached / 1024;
315 ret = 0;
316 break;
317 case hwmon_in_min:
318 case hwmon_in_max:
319 reg = (attr == hwmon_in_min)
320 ? ADT7411_REG_IN_LOW(channel)
321 : ADT7411_REG_IN_HIGH(channel);
322 ret = i2c_smbus_read_byte_data(client, reg);
323 if (ret < 0)
324 goto exit_unlock;
325 *val = ret * data->vref_cached / 256;
326 ret = 0;
327 break;
328 case hwmon_in_alarm:
329 ret = adt7411_read_in_alarm(dev, channel, val);
330 break;
331 default:
332 ret = -EOPNOTSUPP;
333 break;
334 }
335 exit_unlock:
336 mutex_unlock(&data->update_lock);
337 return ret;
338}
339
340static int adt7411_read_in(struct device *dev, u32 attr, int channel,
341 long *val)
342{
343 if (channel == 0)
344 return adt7411_read_in_vdd(dev, attr, val);
345 else
346 return adt7411_read_in_chan(dev, attr, channel, val);
347}
348
349
350static int adt7411_read_temp_alarm(struct device *dev, u32 attr, int channel,
351 long *val)
352{
353 struct adt7411_data *data = dev_get_drvdata(dev);
354 struct i2c_client *client = data->client;
355 int ret, bit;
356
357 ret = i2c_smbus_read_byte_data(client, ADT7411_REG_STAT_1);
358 if (ret < 0)
359 return ret;
360
361 switch (attr) {
362 case hwmon_temp_min_alarm:
363 bit = channel ? ADT7411_STAT_1_EXT_TEMP_LOW
364 : ADT7411_STAT_1_INT_TEMP_LOW;
365 break;
366 case hwmon_temp_max_alarm:
367 bit = channel ? ADT7411_STAT_1_EXT_TEMP_HIGH_AIN1
368 : ADT7411_STAT_1_INT_TEMP_HIGH;
369 break;
370 case hwmon_temp_fault:
371 bit = ADT7411_STAT_1_EXT_TEMP_FAULT;
372 break;
373 default:
374 return -EOPNOTSUPP;
375 }
376
377 *val = !!(ret & bit);
378 return 0;
379}
380
381static int adt7411_read_temp(struct device *dev, u32 attr, int channel,
382 long *val)
383{
384 struct adt7411_data *data = dev_get_drvdata(dev);
385 struct i2c_client *client = data->client;
386 int ret, reg, regl, regh;
387
388 switch (attr) {
389 case hwmon_temp_input:
390 regl = channel ? ADT7411_REG_EXT_TEMP_AIN14_LSB :
391 ADT7411_REG_INT_TEMP_VDD_LSB;
392 regh = channel ? ADT7411_REG_EXT_TEMP_AIN1_MSB :
393 ADT7411_REG_INT_TEMP_MSB;
394 ret = adt7411_read_10_bit(client, regl, regh, 0);
395 if (ret < 0)
396 return ret;
397 ret = ret & 0x200 ? ret - 0x400 : ret; /* 10 bit signed */
398 *val = ret * 250;
399 return 0;
400 case hwmon_temp_min:
401 case hwmon_temp_max:
402 reg = (attr == hwmon_temp_min)
403 ? ADT7411_REG_TEMP_LOW(channel)
404 : ADT7411_REG_TEMP_HIGH(channel);
405 ret = i2c_smbus_read_byte_data(client, reg);
406 if (ret < 0)
407 return ret;
408 ret = ret & 0x80 ? ret - 0x100 : ret; /* 8 bit signed */
409 *val = ret * 1000;
410 return 0;
411 case hwmon_temp_min_alarm:
412 case hwmon_temp_max_alarm:
413 case hwmon_temp_fault:
414 return adt7411_read_temp_alarm(dev, attr, channel, val);
415 default:
416 return -EOPNOTSUPP;
417 }
418}
419
420static int adt7411_read(struct device *dev, enum hwmon_sensor_types type,
421 u32 attr, int channel, long *val)
422{
423 switch (type) {
424 case hwmon_in:
425 return adt7411_read_in(dev, attr, channel, val);
426 case hwmon_temp:
427 return adt7411_read_temp(dev, attr, channel, val);
428 default:
429 return -EOPNOTSUPP;
430 }
431}
432
433static int adt7411_write_in_vdd(struct device *dev, u32 attr, long val)
434{
435 struct adt7411_data *data = dev_get_drvdata(dev);
436 struct i2c_client *client = data->client;
437 int reg;
438
439 val = clamp_val(val, 0, 255 * 7000 / 256);
440 val = DIV_ROUND_CLOSEST(val * 256, 7000);
441
442 switch (attr) {
443 case hwmon_in_min:
444 reg = ADT7411_REG_VDD_LOW;
445 break;
446 case hwmon_in_max:
447 reg = ADT7411_REG_VDD_HIGH;
448 break;
449 default:
450 return -EOPNOTSUPP;
451 }
452
453 return i2c_smbus_write_byte_data(client, reg, val);
454}
455
456static int adt7411_write_in_chan(struct device *dev, u32 attr, int channel,
457 long val)
458{
459 struct adt7411_data *data = dev_get_drvdata(dev);
460 struct i2c_client *client = data->client;
461 int ret, reg;
462
463 mutex_lock(&data->update_lock);
464 ret = adt7411_update_vref(dev);
465 if (ret < 0)
466 goto exit_unlock;
467 val = clamp_val(val, 0, 255 * data->vref_cached / 256);
468 val = DIV_ROUND_CLOSEST(val * 256, data->vref_cached);
469
470 switch (attr) {
471 case hwmon_in_min:
472 reg = ADT7411_REG_IN_LOW(channel);
473 break;
474 case hwmon_in_max:
475 reg = ADT7411_REG_IN_HIGH(channel);
476 break;
477 default:
478 ret = -EOPNOTSUPP;
479 goto exit_unlock;
480 }
481
482 ret = i2c_smbus_write_byte_data(client, reg, val);
483 exit_unlock:
484 mutex_unlock(&data->update_lock);
485 return ret;
486}
487
488static int adt7411_write_in(struct device *dev, u32 attr, int channel,
489 long val)
490{
491 if (channel == 0)
492 return adt7411_write_in_vdd(dev, attr, val);
493 else
494 return adt7411_write_in_chan(dev, attr, channel, val);
495}
496
497static int adt7411_write_temp(struct device *dev, u32 attr, int channel,
498 long val)
499{
500 struct adt7411_data *data = dev_get_drvdata(dev);
501 struct i2c_client *client = data->client;
502 int reg;
503
504 val = clamp_val(val, -128000, 127000);
505 val = DIV_ROUND_CLOSEST(val, 1000);
506
507 switch (attr) {
508 case hwmon_temp_min:
509 reg = ADT7411_REG_TEMP_LOW(channel);
510 break;
511 case hwmon_temp_max:
512 reg = ADT7411_REG_TEMP_HIGH(channel);
513 break;
514 default:
515 return -EOPNOTSUPP;
516 }
517
518 return i2c_smbus_write_byte_data(client, reg, val);
519}
520
521static int adt7411_write(struct device *dev, enum hwmon_sensor_types type,
522 u32 attr, int channel, long val)
523{
524 switch (type) {
525 case hwmon_in:
526 return adt7411_write_in(dev, attr, channel, val);
527 case hwmon_temp:
528 return adt7411_write_temp(dev, attr, channel, val);
529 default:
530 return -EOPNOTSUPP;
531 }
532}
533
534static umode_t adt7411_is_visible(const void *_data,
535 enum hwmon_sensor_types type,
536 u32 attr, int channel)
537{
538 const struct adt7411_data *data = _data;
539 bool visible;
540
541 switch (type) {
542 case hwmon_in:
543 visible = channel == 0 || channel >= 3 || !data->use_ext_temp;
544 switch (attr) {
545 case hwmon_in_input:
546 case hwmon_in_alarm:
547 return visible ? S_IRUGO : 0;
548 case hwmon_in_min:
549 case hwmon_in_max:
550 return visible ? S_IRUGO | S_IWUSR : 0;
551 }
552 break;
553 case hwmon_temp:
554 visible = channel == 0 || data->use_ext_temp;
555 switch (attr) {
556 case hwmon_temp_input:
557 case hwmon_temp_min_alarm:
558 case hwmon_temp_max_alarm:
559 case hwmon_temp_fault:
560 return visible ? S_IRUGO : 0;
561 case hwmon_temp_min:
562 case hwmon_temp_max:
563 return visible ? S_IRUGO | S_IWUSR : 0;
564 }
565 break;
566 default:
567 break;
568 }
569 return 0;
570}
571
572static int adt7411_detect(struct i2c_client *client,
573 struct i2c_board_info *info)
574{
575 int val;
576
577 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
578 return -ENODEV;
579
580 val = i2c_smbus_read_byte_data(client, ADT7411_REG_MANUFACTURER_ID);
581 if (val < 0 || val != ADT7411_MANUFACTURER_ID) {
582 dev_dbg(&client->dev,
583 "Wrong manufacturer ID. Got %d, expected %d\n",
584 val, ADT7411_MANUFACTURER_ID);
585 return -ENODEV;
586 }
587
588 val = i2c_smbus_read_byte_data(client, ADT7411_REG_DEVICE_ID);
589 if (val < 0 || val != ADT7411_DEVICE_ID) {
590 dev_dbg(&client->dev,
591 "Wrong device ID. Got %d, expected %d\n",
592 val, ADT7411_DEVICE_ID);
593 return -ENODEV;
594 }
595
596 strlcpy(info->type, "adt7411", I2C_NAME_SIZE);
597
598 return 0;
599}
600
601static int adt7411_init_device(struct adt7411_data *data)
602{
603 int ret;
604 u8 val;
605
606 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG3);
607 if (ret < 0)
608 return ret;
609
610 /*
611 * We must only write zero to bit 1 and bit 2 and only one to bit 3
612 * according to the datasheet.
613 */
614 val = ret;
615 val &= ~(ADT7411_CFG3_RESERVED_BIT1 | ADT7411_CFG3_RESERVED_BIT2);
616 val |= ADT7411_CFG3_RESERVED_BIT3;
617
618 ret = i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG3, val);
619 if (ret < 0)
620 return ret;
621
622 ret = i2c_smbus_read_byte_data(data->client, ADT7411_REG_CFG1);
623 if (ret < 0)
624 return ret;
625
626 data->use_ext_temp = ret & ADT7411_CFG1_EXT_TDM;
627
628 /*
629 * We must only write zero to bit 1 and only one to bit 3 according to
630 * the datasheet.
631 */
632 val = ret;
633 val &= ~ADT7411_CFG1_RESERVED_BIT1;
634 val |= ADT7411_CFG1_RESERVED_BIT3;
635
636 /* enable monitoring */
637 val |= ADT7411_CFG1_START_MONITOR;
638
639 return i2c_smbus_write_byte_data(data->client, ADT7411_REG_CFG1, val);
640}
641
642static const u32 adt7411_in_config[] = {
643 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
644 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
645 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
646 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
647 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
648 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
649 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
650 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
651 HWMON_I_INPUT | HWMON_I_MIN | HWMON_I_MAX | HWMON_I_ALARM,
652 0
653};
654
655static const struct hwmon_channel_info adt7411_in = {
656 .type = hwmon_in,
657 .config = adt7411_in_config,
658};
659
660static const u32 adt7411_temp_config[] = {
661 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
662 HWMON_T_MAX | HWMON_T_MAX_ALARM,
663 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MIN_ALARM |
664 HWMON_T_MAX | HWMON_T_MAX_ALARM | HWMON_T_FAULT,
665 0
666};
667
668static const struct hwmon_channel_info adt7411_temp = {
669 .type = hwmon_temp,
670 .config = adt7411_temp_config,
671};
672
673static const struct hwmon_channel_info *adt7411_info[] = {
674 &adt7411_in,
675 &adt7411_temp,
676 NULL
677};
678
679static const struct hwmon_ops adt7411_hwmon_ops = {
680 .is_visible = adt7411_is_visible,
681 .read = adt7411_read,
682 .write = adt7411_write,
683};
684
685static const struct hwmon_chip_info adt7411_chip_info = {
686 .ops = &adt7411_hwmon_ops,
687 .info = adt7411_info,
688};
689
690static int adt7411_probe(struct i2c_client *client,
691 const struct i2c_device_id *id)
692{
693 struct device *dev = &client->dev;
694 struct adt7411_data *data;
695 struct device *hwmon_dev;
696 int ret;
697
698 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
699 if (!data)
700 return -ENOMEM;
701
702 i2c_set_clientdata(client, data);
703 data->client = client;
704 mutex_init(&data->device_lock);
705 mutex_init(&data->update_lock);
706
707 ret = adt7411_init_device(data);
708 if (ret < 0)
709 return ret;
710
711 /* force update on first occasion */
712 data->next_update = jiffies;
713
714 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,
715 data,
716 &adt7411_chip_info,
717 adt7411_groups);
718 return PTR_ERR_OR_ZERO(hwmon_dev);
719}
720
721static const struct i2c_device_id adt7411_id[] = {
722 { "adt7411", 0 },
723 { }
724};
725MODULE_DEVICE_TABLE(i2c, adt7411_id);
726
727static struct i2c_driver adt7411_driver = {
728 .driver = {
729 .name = "adt7411",
730 },
731 .probe = adt7411_probe,
732 .id_table = adt7411_id,
733 .detect = adt7411_detect,
734 .address_list = normal_i2c,
735 .class = I2C_CLASS_HWMON,
736};
737
738module_i2c_driver(adt7411_driver);
739
740MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de> and "
741 "Wolfram Sang <w.sang@pengutronix.de>");
742MODULE_DESCRIPTION("ADT7411 driver");
743MODULE_LICENSE("GPL v2");